126 results about "Pressure increase" patented technology

An injection device (2) of an injection molding machine (1) includes a heating cylinder (18) having a gas introduction port (30) and a screw (19), and a gas supply device (5) is connected to the gas introduction port (30). The gas supply device (5) includes a gas supply source (33) and a gas pressure regulating unit (34). The gas pressure regulating unit (34) regulates a gas pressure and supplies the gas when a gas from the gas supply source (33) is introduced into the gas introduction port (30). Specifically, the gas pressure is caused to change in a molding cycle and is increased to a high pressure in a metering process (61). That is, a pressure increasing period (71) in which the gas pressure increases at least partially overlaps with the metering process (61).

The invention discloses a method and a device for controlling the flow rate of pressurized air flow of a bed layer of a pressure swing adsorption device, and relates to the technical field of adsorption control. The method and the device for controlling the flow rate of the pressurized air flow of the bed layer of the pressure swing adsorption device comprise the following steps: S1, acquiring pressure difference state data in real time, and preprocessing the pressure difference state data; s2, slip sheet displacement balance is carried out on the differential pressure state data; s3, throttling opening response is conducted on the pressure difference state data; s4, setting a movement boundary of the slip sheet; and S5, the pressure difference state data, the sliding vane displacement balance result and the throttling opening response result are synthesized to execute buffer energy consumption evaluation. The problems that the throttling opening is fixed, the gas flux cannot be dynamically adjusted according to the actual working condition and the adjusting rigidity and the energy efficiency are reduced due to the fact that the front and back pressure difference change of the adsorption tower cannot be sensed in real time in the throttling process and a pressure difference driven feedback adjusting mechanism is lacked are solved.

The utility model discloses a full -automatic embedded part injection molding takes out piece packaging machine belongs to injection molding machine technical field, it includes work table, work table top fixed mounting has fixed mould, the fixed mould is buckled and is connected with embedded part main part, the sliding block with the guide rail sliding connection, the sliding block is located between the guide rail with the embedded part main part, the guide rail is the inclined structure, the utility model discloses through the heat absorption block absorption external heat like the heat source of mould processing, the heat transfer to first air cylinder, and the heated expansion gas (like nitrogen) in first air cylinder and second air cylinder expands in volume because temperature rises, and pressure increases, and the telescopic link of movable block outside pushes the sliding block and slides on the inclined guide rail, because the guide rail is the inclined structure, the sliding of sliding block will produce the component force along the guide rail direction, and then will embedded part main part extrude to the inboard of fixed mould, avoids in the injection molding process and causes the displacement of embedded part to influence injection molding effect.

Provided is a method for evaluating the air tightness of a case, which can achieve space saving and cost reduction and can shorten the time required for evaluating the air tightness of a plurality of cases. This method for evaluating the airtightness of a housing comprises: a first pressurization / depressurization step in which a first pump connected to a first housing via a first pipe is operated to depressurize or depressurize the inside of the first housing; a first pressure change measurement step for measuring the amount of pressure change in the first housing by means of an evaluation device connected to the first housing via a second pipe after the pressure in the first housing is stabilized; and a first evaluation step for evaluating the airtightness of the first housing by means of an evaluation device on the basis of the amount of change in pressure within the first housing, in which a first valve provided in the first pipe is opened, a second valve provided in the second pipe is closed, a first pressure increasing / decreasing step is performed, the first valve is closed, and a second pressure increasing / decreasing step is performed. A first pressure change measurement step is performed by opening the second valve.

The invention discloses a raw material mixing machine stirring shaft sealing strengthening assembly which comprises an assembly sleeve, and an inner filling sleeve is fixedly connected to the interior of the assembly sleeve. Through the arrangement of the side through cavity and the inner mounting sleeve, a gas circulation cavity is formed in the side through cavity and the inner mounting sleeve after mounting, the micro pressure sensor is matched, when it is detected that the pressure in the assembly sleeve is greatly increased, the pressure in the mixing machine changes, gas is injected into the assembly sleeve through gas supply equipment, and the pressure in the mixing machine changes; the gas pressure in the assembly sleeve is increased, the static ring and the movable ring can be secondarily extruded, the sealing effect is improved, medicine in the mixer is prevented from flowing out, meanwhile, the up-down double-sealing type design is adopted, the sealing effect is further improved, meanwhile, the internal pressing force can be adjusted according to different pressure changes in the mixer, and the sealing effect is improved. Excessive abrasion of a sealing piece caused by too high pressure can be prevented, sealing failure when the pressure is reduced can be avoided, the sealing reliability is remarkably improved, and the maintenance frequency is reduced.

The utility model relates to a magnetic sealing device with high sealing performance, which is applied to the technical field of mechanical engineering sealing and realizes that under normal conditions, the temperature of a rotating shaft can be maintained within a normal range, at the moment, an elastic diaphragm cannot be contacted with a control switch even if the elastic diaphragm slightly expands and bulges due to air pressure, and when a magnetic sealing structure goes wrong, the elastic diaphragm cannot be contacted with the control switch. When the temperature of the rotating shaft rises, the air pressure on the inner side of the inner-layer cover is increased, the elastic diaphragm expands and protrudes outwards due to the increase of the air pressure, when the temperature of the rotating shaft is too high, the elastic diaphragm expands to a large degree, and when the elastic diaphragm rotates to the control switch along with the rotating shaft, the control switch is extruded and triggered, so that the alarm is triggered to remind a worker to go to overhaul; and meanwhile, the electromagnetic block is electrified through the control switch, so that the electromagnetic block is magnetically attracted through the magnetic sheet so as to be separated from the elastic diaphragm, and the elastic diaphragm is prevented from being in contact with the control switch during continuous rotation of the rotating shaft to cause abrasion to the elastic diaphragm.

The present application belongs to the field of railway technology, and relates to a turnout area snow melting and deicing device, which comprises a shell, a pressure increasing device, and a driving device connected with the pressure increasing device. The shell comprises a first cavity which is arranged as a sealed cavity. The driving device and the pressure increasing device are arranged in the first cavity. The driving device is provided with at least one gas passage. The gas passage is in communication with the outside of the first cavity at the gas inlet end, and in communication with the inside of the first cavity at the gas outlet end. The air outlet of the pressure increasing device is in communication with the outside of the shell. The driving device drives the pressure increasing device to act. Negative pressure is generated at the air inlet of the pressure increasing device. Under the action of the pressure difference between the inside and outside of the first cavity, the gas outside the first cavity enters the first cavity through the gas passage, is sucked into the pressure increasing device, is compressed in the pressure increasing device, and is sprayed out of the air outlet of the pressure increasing device. The driving device and the pressure increasing device rotate synchronously. The compressed high-pressure air is sprayed out of the air outlet of the pressure increasing device at high speed. The device is convenient to install and use.

The invention provides an air-water pressure balance experiment device and an experiment method. The air-water pressure balance experiment device comprises a cylinder body, a water pressure sensor, a water injection device and an air inflation device. In the experiment process, a soil sample can be added into the cylinder, a water source is input into the cylinder through the water injection device, so that the water source is saturated in the soil sample, then the air inflation device inflates air into the cylinder through the air injection ring, the soil sample can be filled with air along with the increase of the pressure of the inflated air, and the water source is filled into the cylinder through the air injection ring. Whether an inflation mode can play an effective role in cutting off a water source is judged by monitoring whether the water source is still discharged from the drainage pipe, the height of air in the soil sample rises upwards along with the increase of air pressure, and when the air spreads to the corresponding water pressure sensor, the pressure value of the water pressure sensor is increased along with the increase of the air. Therefore, the spreading depth of the air and the corresponding pressure value under the corresponding soil sample can be obtained, and data support is provided for later foundation pit water seepage prevention.

The utility model relates to the technical field of gas-liquid mixed transportation pressurization, in particular to a gas-liquid mixed transportation pressurization device which comprises a shell, a front cover and a rear cover, the front cover is installed on one side of the shell, the rear cover is installed on the side, away from the front cover, of the shell, an inlet is formed in one side of the upper portion of the shell, and an outlet is formed in the other side of the upper portion of the shell. When the supercharging device is used, the eccentric shaft drives the cock to slide tightly close to the interior of the shell, the shell forms a closed cavity which changes periodically, negative pressure is generated in the shell to suck a medium, the cock extrudes the medium in the shell to achieve the purpose of supercharging conveying, and the cock is tightly attached to the shell to reduce mechanical friction. And large torque is provided through an eccentric structure formed by the eccentric shaft, the cock and the interior of the shell, operation noise is reduced, and noise pollution generated when the device is used is reduced.

The application discloses a test bench, which comprises a filter, a solenoid valve, a pressure increasing valve, an exhaust valve, a pressure detector and a computer system, wherein the filter is used for filtering impurities and moisture in gas; the solenoid valve is arranged in a test pipeline and is used for controlling the opening and closing of the test pipeline; the pressure increasing valve is connected with the filter and the solenoid valve and is used for increasing the gas pressure entering the solenoid valve; the exhaust valve is connected with the test pipeline and is used for discharging gas in the test pipeline; the pressure detector is connected with the test pipeline and is used for detecting the gas pressure in the test pipeline; and the computer system is connected with the pressure detector, the solenoid valve and the exhaust valve and is used for controlling the opening and closing of the solenoid valve according to the pressure value detected by the pressure detector and controlling the opening and closing of the exhaust valve. The test bench can realize the automatic operation of the test pipeline cleaning and pressure maintaining test, thereby reducing the manual labor and improving the work efficiency.

The application discloses a pipeline structure for multistage compressor series connection, which comprises a first pipe body and a second pipe body connected with each other, a first cavity, a second cavity and a third cavity are sequentially arranged in the first pipe body along the length direction, the cross-sectional dimension of the second cavity is smaller than that of the third cavity; a fourth cavity and a fifth cavity are sequentially arranged in the second pipe body along the length direction, the cross-sectional dimension of the fourth cavity is smaller than that of the third cavity; a valve body is slidably arranged in the third cavity, the length of the valve body is smaller than the depth of the third cavity, and a flow channel communicating with the third cavity and the fourth cavity is arranged in the valve body. The application can automatically increase the pressure of the gas when the pressure of the gas is small, and can automatically make part of the gas directly jump over the pressure increasing stage when the pressure of the gas is large, which is beneficial to optimizing the load distribution and effectively improving the pressure increasing efficiency and the cycle transfer efficiency of the multistage compressor.

The utility model relates to the technical field of micro-water sensors, in particular to a precise micro-water sensor. According to the technical scheme, the pressure relief device comprises a device body, an air inlet and an air outlet are formed in the device body, the pressure relief device further comprises a pressure relief compensation module installed on the air inlet, the pressure relief compensation module comprises a connecting hole communicated with the air inlet and an exhaust hole communicated with the outside, and the pressure relief compensation module is connected with the air inlet according to the air flow rate at the air inlet. And the flow rate of gas entering the connecting hole and the exhaust hole is controlled. Through the arrangement of the pressure relief compensation module, when the external air pressure is increased, the external air pressure can be effectively relieved, the flow rate of air entering the air inlet hole is prevented from being increased, the bearing range of the machine body to the external air pressure can be effectively enlarged, and the flow rate of the air in the machine body is prevented from exceeding the specified range.

The present application relates to a kind of exhaust pressure stabilizing safety valve body module, for solving the complex structure of the existing similar coffee machine pressure stabilizing, pressure relief, higher cost input, and when water tank has no water, the problem of not water after electromagnetic pump emptying.The valve body module includes multi-channel main body, exhaust assembly, the exhaust port of the inner passage of the multi-channel main body is provided with the exhaust assembly, the exhaust pin of exhaust assembly is slidingly limited in the inner end of exhaust port, exhaust pipe connector is sealingly fixed to the outer end of exhaust port, the spring is arranged between the inner end of exhaust pin and the inner end of exhaust pipe connector, the side of exhaust pin is provided with exhaust groove, under the initial action of spring, the inner end of exhaust pin and the inner end of exhaust port are abutted to form sealed state;When the inner end of exhaust pin is compressed by the pressure increase of the inner passage of multi-channel main body, the inner end of exhaust pin and exhaust port are unsealed, and part of gas-liquid in channel body is discharged through the exhaust groove in the side of exhaust pin and exhaust pipe connector.

The power storage device includes a housing having a frame member and a power storage unit (power storage module) housed in the housing. The frame member is provided with an exhaust path that guides the gas discharged from the power storage unit to the outside of the housing. The exhaust path is provided with a blocking member (detection member) that blocks the exhaust path. The blocking member is configured to be broken by a pressure increase due to the gas discharged from the power storage unit.

The invention relates to the technical field of rock core experimental analysis of oil and gas field development, in particular to a reservoir permeability stress sensitivity determination method, system and equipment and a storage medium. The method comprises the steps that the confining pressure of a rock core holder is periodically increased and decreased according to the same pressure intensity difference; after each confining pressure rising and falling period, calculating the current effective stress and rock core permeability sensitivity of the target rock core, and calculating the relative deviation between the current effective stress and rock core permeability sensitivity of the target rock core and the current effective stress and rock core permeability sensitivity of the target rock core after the previous confining pressure rising and falling period; and repeating the method until the relative deviation is smaller than a threshold value, and taking the current effective stress and the core permeability sensitivity as the permeability stress sensitivity of the corresponding gas reservoir. The gas reservoir permeability stress sensitivity evaluation method provided by the invention is simple to operate and reliable in experimental result, and can quickly, effectively and conveniently evaluate the gas reservoir permeability stress sensitivity degree.

The utility model provides a soft sealing type high-pressure ball valve which comprises a main body, an air inlet and an expansion pipe, an adjusting knob is arranged on the top of the main body, an air outlet is formed in the rear side of the main body, the air inlet is formed in the front side of the main body, and the expansion pipe is arranged on the front side of the air inlet. Compared with the prior art, the device has the advantages that by arranging the flow collecting cover, the rotating base, the rotating wheel and the brush, high-pressure gas entering the flow collecting cover is collected and blown to the rotating wheel, so that the rotating wheel is driven to rotate, the brush is driven to brush the inner wall of the expansion pipe, impurity particles are prevented from being adsorbed on the inner wall of the expansion pipe, and the expansion pipe is prevented from being blocked; by arranging the flow slowing plate, the flow speed of high-pressure and high-temperature gas can be reduced, the speed and flow of the gas entering the main body are slowed down, the situation that the working pressure of the main body is increased due to too large pressure, and gas leakage is caused is prevented, by arranging the first threaded connecting pipe, the first screwing hole, the second threaded connecting pipe and the second screwing hole, the expansion pipe can be detached, and maintenance and cleaning are convenient; the working efficiency is improved.

A piston-cylinder assembly (100) comprises a cylinder (200) with a cylinder wall (240) extending along a longitudinal central axis (A) from a first end (210) to a second end (220) opposite the first end, a piston (300) slidably arranged in the cylinder (200), and a piston rod (310) attached to one side of the piston (300) by means of which the piston (300) is slidably arranged within a cylinder chamber (230) of the cylinder (200) and is guided out of the cylinder (200) at the second end (220) by a guide and sealing device. The cylinder chamber (230) is filled with a pressurized fluid.To enable controlled and reliable pressure relief in the event of a pressure increase inside the cylinder, a safety diaphragm (400) is arranged between the piston (300) and the first end (210) of the cylinder (200), sealing the cylinder chamber (230) against a hollow chamber (600). The hollow chamber (600) is atmospherically connected to the outside environment of the cylinder (200) via a radial channel (610) in the cylinder wall (240).

The invention provides a method for judging crack initiation of low-maturity shale in supercritical carbon dioxide heating, and belongs to the technical field of low-maturity shale. Carrying out a high-temperature mechanical experiment, a hydrocarbon generation pressurization experiment, a pyrolysis kinetics experiment and a supercritical carbon dioxide soaking experiment to calibrate key coefficients, substituting the parameters into a multi-field coupling crack initiation pressure formula to calculate the crack initiation pressure at each moment, inputting a physical constraint diagram attention recursive network to output and correct the crack initiation pressure and safety margin, and calculating the crack initiation pressure. And when the safety margin is lower than an early warning threshold value, the crack initiation moment is predicted through a two-step approximation method, and construction parameters are adjusted, so that the technical problem that the crack initiation moment of the low-maturity shale in supercritical carbon dioxide heating cannot be accurately judged in real time under the multi-field coupling condition is solved.

This application relates to a method and system for removing water from a carbon dioxide fluid using triethylene glycol, and the application of this method in transporting supercritical carbon dioxide fluid. The method includes calculating a correction factor: obtaining a correction factor R based on the critical pressure of the carbon dioxide fluid according to formula (I): R = 0.7195 - 0.02729P c +0.0118T(I), where P c The critical pressure of the carbon dioxide fluid is given by T, where T is the temperature range of 20℃-30℃; the corrected pressure is calculated using formula (II). b :P b =P c *R(II); Pressure-boosted dehydration: The pressure of the carbon dioxide fluid is increased to the corrected pressure P through multi-stage pressure-boosted cooling. b The process involves cooling to remove some of the water from the carbon dioxide fluid, with the temperature after each stage of pressurization and cooling controlled within the range of 20°C to 30°C. Triethylene glycol dehydration is then performed, using a triethylene glycol absorbent to further remove water from the pressurized and dehydrated carbon dioxide fluid. The method and system of this application can reduce energy consumption and lower process costs.

The invention belongs to the technical field of nuclear reactor monitoring, and particularly relates to a neutron tube air pressure real-time monitoring method and system, and the method comprises the steps: obtaining basic electrical parameters and environmental data of a neutron tube work period, and carrying out the statistical calculation, obtaining hydrogen storage device average voltage, hydrogen storage device average current, an ion source output flow average value and an ion source output flow standard deviation, and calculating an effective thermal thrust index, a beam fluctuation index and a thermoelectric conversion quality score; obtaining a corrected air pressure value; converting the corrected air pressure value into a real-time physical air pressure value; on the basis of the real-time physical air pressure value, generating a pressure increasing, pressure reducing or maintaining adjusting instruction; adjusting the current of the hydrogen storage device according to the adjusting instruction. The method effectively solves the problem that the traditional method is difficult to accurately invert the real air pressure in the pipe through a single dimension, resulting in lagging or misalignment of air pressure adjustment.

This utility model discloses a metal explosion-proof valve, belonging to the field of explosion-proof valve technology. It includes a base with several mounting holes, a pressure cap fitted onto the base, several brackets fixedly mounted on the side of the base, and an electric actuator fixedly mounted between the brackets. The piston rod end of the electric actuator engages with the pressure cap. Several elastic units are provided on the side of the base, and these elastic units also engage with the pressure cap. Several fixing rods are fixedly mounted on the side of the base. By configuring the base in conjunction with the pressure cap, electric actuator, and spring, when flammable and explosive gases are generated inside the sealed equipment enclosure, causing excessive pressure, the electric actuator is activated. The electric actuator drives the pressure cap to open, achieving rapid venting and pressure relief. When thermal runaway further deteriorates, causing the electric actuator to lose power, the pressure increases to exceed the spring force, which in turn drives the pressure cap to open passively, thus achieving both active and passive dual safety protection functions.

The application relates to the technical field of blood pressure simulator calibration, and discloses a blood pressure simulator repeatability calibration method and a calibration device, which comprises the following steps: locking static pressure through micro-volume adjustment of a pressure building cylinder to evaluate signal stability; utilizing dynamic compensation of pressure building cylinder volume and pressure reducing valve opening degree adjustment to make the gas path pressure linearly and uniformly decrease at a set rate, and synchronously collecting full envelope data; adopting a numerical fitting algorithm to construct an envelope model to position actual average pressure; repeatedly performing multiple measurements and calculating experimental standard deviation to obtain repeatability results. The device comprises a host computer, a mainboard, a driver and a gas path system, wherein a gas pump, a gas capacitor and a pressure increasing valve are connected in series in the gas path system, and a pressure reducing valve, a pressure building cylinder and a high-precision module are connected in parallel in a common gas path. Through the cooperative control of the pressure building cylinder and the pressure reducing valve, the application solves the problem of pressure reducing nonlinearity, improves the accuracy of actual average pressure positioning and the precision of repeatability evaluation.

The invention provides a long-distance pipeline hydrostatic test innovation method and related equipment, and the method comprises the steps: carrying out the pressure test segmentation of a long-distance pipeline based on the related parameters of the long-distance pipeline, so as to obtain a first-stage pipe section; according to a water filling control condition, the pipe section of the stage is filled with water, so that a pipe section of a second stage is obtained; continuously injecting water into the pipe section in the second stage to increase the pressure of the pipe section in the second stage to thermodynamic equilibrium pressure to obtain a pipe section in a third stage; boosting the pipe section of the third stage to obtain a first detection result and a pipe section of a fourth stage; in response to the fact that the first detection result is qualified, the air existing amount in the pipe section is calculated, and a second detection result and the pipe section of the fifth stage are obtained; performing a sealing test on the pipe section in response to the fact that the second detection result is qualified so as to obtain a third detection result; and if the third detection result is qualified, determining that the quality of the long-distance pipeline is qualified. Through the method, the accuracy of quality detection of the long-distance pipeline can be improved.

The utility model discloses a vortex type gas multiphase mixed transportation supercharging device, which relates to the technical field of oil exploitation, and comprises a fixed shell and a mixing pipe, the fixed shell is internally provided with a transmission mechanism for conveying oil, and one side of the fixed shell is fixedly connected with a liquid pumping pipe in a penetrating manner; the top of the end, away from the liquid pumping pipe, of the fixing shell is fixedly connected with a guiding-out pipe in a penetrating mode, a fixing shaft is rotationally connected into the mixing pipe, a first motor is fixedly connected to one side of the mixing pipe, a transmission shaft of the first motor is fixedly connected to one end of the fixing shaft, and first spiral blades, mixing blades and rotating blades are fixedly connected to the surface of the fixing shaft. The problems that after pressurization, the oil pressure and the flow speed in the device are increased, the fusion degree of gas is possibly not enough when the gas is mixed, slug flow is formed when the fusion degree of the gas is not enough, so that the pressure fluctuation of a pipeline is violent, and gas-liquid separation is not thorough easily when separation is needed in the later period are solved.

The application discloses a kind of quasi-triaxial rock mechanics testing device, belong to oil and gas exploitation technical field.It includes: the confining pressure oil is stored in confining pressure chamber, and the confining pressure chamber is in full oil state;Delivery component, the delivery component is used to send experimental sample to the confining pressure chamber;Liquid level adjusting component, the liquid level adjusting component is connected with the confining pressure chamber for adjusting the oil liquid saturation state of confining pressure oil in the confining pressure chamber;Pressure increasing component, the pressure increasing component is connected with the confining pressure chamber for applying confining pressure to the sample in the confining pressure chamber;Pore pressure adjusting component, the pore pressure adjusting component is connected with experimental sample for applying pore pressure to experimental sample;Temperature adjusting assembly, the temperature adjusting assembly is connected with the confining pressure chamber for adjusting the temperature of confining pressure oil in the confining pressure chamber.The confining pressure chamber is set to store confining pressure oil, without oil injection before each test, oil discharge after test, avoid the time consumption of injection / oil discharge, effectively improve the test efficiency.

The invention provides a compressor which can effectively reduce stop pressure according to operation cycle time regardless of continuous operation based on an unloading function or a speed change function based on an inverter. The compressor (100) comprises an electric motor (104), a compressor body (103) driven by the electric motor (104) to generate compressed gas (109), a container (10) for storing the compressed gas (109) generated by the compressor body (103), a pressure detector (112) for detecting the pressure of the compressed gas (109) in the container (107), and a control part (115) for controlling the power supplied to the electric motor (104) according to the detection result of the pressure detector (112). The control unit (115) determines whether or not a pressure increase / decrease period (TOFF + TON) for the pressure reaching the stop pressure (202), the pressure decreasing to the start pressure (204), and the pressure reaching the stop pressure (202) exceeds a first period threshold value (210), and decreases the stop pressure by a first pressure change value (PECO or 2PECO) when the pressure increase / decrease period exceeds the first period threshold value (210).

This invention relates to the field of fire pipe testing technology, specifically disclosing a fire pipe pressure resistance testing device and method, comprising: a main frame, a drain pipe, a first ball valve, a fire pipe, a top cover, a pressure boosting chamber, a pressure increasing mechanism, a pressure stabilizing mechanism, a water inlet pipe, a second ball valve, and a pressure gauge. The drain pipe is located at the top center of the inner cavity of the main frame, with its top extending beyond the top of the main frame. The first ball valve is installed on the outer wall of the drain pipe, and the bottom end of the fire pipe is connected to the top of the drain pipe via flange bolts. This device effectively overcomes the shortcomings of traditional static pressure testing in assessing dynamic impact effects, enabling more comprehensive and accurate verification of the structural integrity and pressure-bearing capacity of fire pipes under complex working conditions. It significantly improves the reliability of the test results, thereby ensuring that fire pipes have the ability to continuously and stably deliver fire-fighting water in practical applications, and greatly reducing the risk of pipe rupture or leakage due to water hammer effect.

The invention relates to a system (10) for providing steam in a urea production plant (100), having: - at least one first steam drum (11), which is adapted so as to receive steam at a first pressure level (D1) and to supply same to a stripper (101) for the urea synthesis; and - at least one second steam drum (12) which is connected downstream of the first steam drum (11) in the flow direction (SR) and is connected thereto in order to transfer steam condensate (DK1, DK3), the second steam drum (12) being adapted so as to contain steam (D2) and / or steam condensate (DK2) at a second lower pressure level. The system (10) also has - at least one compressor unit (13) which is connected to the second steam drum (12) and is adapted so as to increase the pressure of the steam (D2) at the second pressure level to the first higher pressure level by compressing the steam, the compressor unit (13) being connected upstream of the first steam drum (11) in the flow direction (SR); and / or - at least one heat transfer unit which is connected upstream of the at least one second steam drum (12) and is adapted so as to transfer heat to the steam condensate (DKS) from a collecting container (16) of the system (10) in such a way that steam (D2) at the second pressure level is produced for further use.

A system and method for replenishing a liquefied fuel (e.g., hydrogen) is provided. The system includes a cryogenic tank for storing a liquefied fuel, a pump insertable into the cryogenic tank, and a switching valve. The pump has a piston, an inlet, and an isolation valve configured to supply the liquefied fuel to the inlet. The switching valve is controlled to flow vapor from the pump and the liquefied fuel contacting a backside of the piston to the inlet of the pump. At least one block valve is also connected with the cryogenic tank and the pump. At least one of the switching valve, the at least one block valve, and the isolation valve is controllable to operate the system in one of three operating modes including a pressure increase mode, a pressure hold mode, and a pressure decrease mode.